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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c7f5fd97fed6e69300837cde1bad98b0877321a1b873c43c4d812bf80d949d' 
  AND token = 'erNfZp9OJebiiccvRF8E89GoNTazc/sERD8oeM8ER2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}